Drools is a business rule management system (BRMS) and an enhanced Rules Engine implementation, ReteOO, based on Charles Forgy's Rete algorithm tailored for the Java language. More importantly, Drools provides for Declarative Programming and is flexible enough to match the semantics of your problem domain with Domain Specific Languages, graphical editing tools, web based tools and developer productivity tools.
Joda-Time provides a quality replacement for the Java date and time classes. The design allows for multiple calendar systems, while still providing a simple API. The 'default' calendar is the ISO8601 standard which is used by XML. The Gregorian, Julian, B
Exploratory visualization based on multiple coordinated views. Improvise has been used to explore election results, particle trajectories, network loads, music collections, the chemical elements, and even the dynamic coordination structure of its own vis
M. Halvey, и M. Keane. WWW '07: Proceedings of the 16th international conference on World Wide Web, стр. 1313--1314. New York, NY, USA, ACM Press, (2007)